Active Brake Booster Friction Loss Detection Using Force Compensation
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Solution Overview
Problem
Existing methods for detecting friction losses and other mechanical inefficiencies in active brake boosters of vehicle braking systems are temperature-dependent and require additional sensors, making them unreliable and complex for monitoring and control.
Innovation Solution
A method to ascertain the mechanically effective power of an active brake booster by calculating a correction value using the assisting force, pressure force, and spring force, allowing for reliable detection of blocking and improved control without the need for additional temperature sensors, and using this information to differentiate between blocking and high-pressure errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are integrated in the active brake booster to detect temperature-dependent friction losses, then measurement precision of friction losses is improved, but device complexity increases
Solution Approach 1:
The active brake booster system uses its own existing sensors (force sensors, position sensors) and control unit to calculate and monitor friction losses internally, without requiring external temperature sensors. The control unit processes data from existing components to determine friction loss values, making the system self-sufficient and avoiding additional hardware complexity.
Solution Approach 2:
The patent replaces direct temperature measurement with a mechanical/mathematical calculation approach. Instead of using temperature sensors to directly measure thermal conditions, the system calculates friction losses by substituting measured forces and positions into a mathematical model, thereby replacing thermal measurement with mechanical measurement and computation.
2Reliability
If additional temperature sensors are added to detect friction losses, then reliability of friction loss detection is improved, but ease of manufacture deteriorates
Solution Approach 1:
The system utilizes existing sensors and the control unit to perform friction loss detection, making the manufacturing process simpler. No additional temperature sensors need to be integrated into the brake booster assembly, reducing manufacturing complexity while maintaining reliable friction loss detection through computational methods.
3Ease of operation
If friction loss detection methods are simplified to avoid temperature sensors, then ease of operation is improved, but measurement precision of friction losses deteriorates
Solution Approach 1:
The patent replaces complex temperature-based friction loss measurement with a simplified mechanical measurement approach using existing force and position sensors. The control unit calculates friction losses by processing mechanical measurements through a mathematical model, achieving both ease of operation (no temperature sensing required) and measurement precision (through computational analysis of mechanical parameters).
Solution Approach 2:
The system changes the measurement parameters from temperature-based to force and position-based measurements. By measuring forces (assist force, counter force) and positions (pedal position, booster position) and calculating friction losses from these parameters, the system achieves accurate friction loss detection while simplifying the operational requirements.
4Device complexity
If existing sensors are used to calculate friction losses without temperature measurement, then device complexity is reduced, but reliability of blocking detection deteriorates
Solution Approach 1:
The patent changes the detection parameters to include friction loss values calculated from existing sensor measurements. By incorporating friction loss compensation into the blocking detection algorithm, the system uses force and position measurements to account for friction effects, thereby maintaining reliable blocking detection without requiring additional temperature sensors or increasing device complexity.
Data Source
AI summary
A method for ascertaining information relating to a mechanically effective power of an active brake booster of a braking system of a vehicle, including: ascertaining a first piece of information relating to an assisting force that is effectuated with the aid of the operated active brake booster, ascertaining a second piece of information relating to a pressure force in a master brake cylinder of the braking system, situated downstream from the active brake booster, the pressure force acting counter to the operated active brake booster, ascertaining a third piece of information relating to a spring force of at least one spring of the active brake booster and/or of the braking system, the spring force acting counter to the operated active brake booster, and establishing the information relating to the mechanically effective power of the active brake booster, taking into consideration the first, second, and third pieces of information.